There are several controllers on the market that test ph, temp, and salinity. There is even one that will give a par reading. As well they can control lights, pumps, auto top off, can detect water leaks and a lot more. The main talked about ones are Apex and Reefkeeper. The are a handful of other ones, including one with Vertex I believe. With this fancy electronics comes a big price tag, anywhere between $300-$700 and more depending what a you add to the system. The best thing to do is Google aquarium controllers or see if you can find forums specifically to the Apex or Reefkeeper.